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Message-Id: <20220804073608.v4.6.I969118a35934a0e5007fe4f80e3e28e9c0b7602a@changeid>
Date: Thu, 4 Aug 2022 07:38:53 -0700
From: Douglas Anderson <dianders@...omium.org>
To: Rob Clark <robdclark@...il.com>,
Abhinav Kumar <quic_abhinavk@...cinc.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Mark Brown <broonie@...nel.org>, linux-arm-msm@...r.kernel.org,
freedreno@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
Douglas Anderson <dianders@...omium.org>,
Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...ux.ie>,
Jonathan Marek <jonathan@...ek.ca>,
Rajeev Nandan <quic_rajeevny@...cinc.com>,
Sean Paul <sean@...rly.run>,
Stephen Boyd <swboyd@...omium.org>,
Vladimir Lypak <vladimir.lypak@...il.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v4 6/6] drm/msm/dsi: Improve dsi_phy_driver_probe() probe error handling
The dsi_phy_driver_probe() function has a "goto fail" for no
reason. Change it to just always return directly when it sees an
error. Make this simpler by leveraging dev_err_probe() which is
designed to make code like this shorter / simpler.
NOTE: as part of this, we now pass through error codes directly from
msm_ioremap_size() rather than translating to -ENOMEM. This changed
mostly because it's much more convenient when using dev_err_probe()
and also it's usually encouraged not to hide error codes like the old
code was doing unless there is a good reason. I can't see any reason
why we'd need to return -ENOMEM instead of -EINVAL from the probe
function.
Signed-off-by: Douglas Anderson <dianders@...omium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
---
Changes in v4:
- Mention error code change in commit message.
Changes in v3:
- ("Improve dsi_phy_driver_probe() probe error handling") new for v3.
drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 74 ++++++++++-----------------
1 file changed, 27 insertions(+), 47 deletions(-)
diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
index 0a00f9b73fc5..57cd525de7a1 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
@@ -621,12 +621,9 @@ static int dsi_phy_driver_probe(struct platform_device *pdev)
phy->pdev = pdev;
phy->id = dsi_phy_get_id(phy);
- if (phy->id < 0) {
- ret = phy->id;
- DRM_DEV_ERROR(dev, "%s: couldn't identify PHY index, %d\n",
- __func__, ret);
- goto fail;
- }
+ if (phy->id < 0)
+ return dev_err_probe(dev, phy->id,
+ "Couldn't identify PHY index\n");
phy->regulator_ldo_mode = of_property_read_bool(dev->of_node,
"qcom,dsi-phy-regulator-ldo-mode");
@@ -634,88 +631,71 @@ static int dsi_phy_driver_probe(struct platform_device *pdev)
phy->cphy_mode = (phy_type == PHY_TYPE_CPHY);
phy->base = msm_ioremap_size(pdev, "dsi_phy", &phy->base_size);
- if (IS_ERR(phy->base)) {
- DRM_DEV_ERROR(dev, "%s: failed to map phy base\n", __func__);
- ret = -ENOMEM;
- goto fail;
- }
+ if (IS_ERR(phy->base))
+ return dev_err_probe(dev, PTR_ERR(phy->base),
+ "Failed to map phy base\n");
phy->pll_base = msm_ioremap_size(pdev, "dsi_pll", &phy->pll_size);
- if (IS_ERR(phy->pll_base)) {
- DRM_DEV_ERROR(&pdev->dev, "%s: failed to map pll base\n", __func__);
- ret = -ENOMEM;
- goto fail;
- }
+ if (IS_ERR(phy->pll_base))
+ return dev_err_probe(dev, PTR_ERR(phy->pll_base),
+ "Failed to map pll base\n");
if (phy->cfg->has_phy_lane) {
phy->lane_base = msm_ioremap_size(pdev, "dsi_phy_lane", &phy->lane_size);
- if (IS_ERR(phy->lane_base)) {
- DRM_DEV_ERROR(&pdev->dev, "%s: failed to map phy lane base\n", __func__);
- ret = -ENOMEM;
- goto fail;
- }
+ if (IS_ERR(phy->lane_base))
+ return dev_err_probe(dev, PTR_ERR(phy->lane_base),
+ "Failed to map phy lane base\n");
}
if (phy->cfg->has_phy_regulator) {
phy->reg_base = msm_ioremap_size(pdev, "dsi_phy_regulator", &phy->reg_size);
- if (IS_ERR(phy->reg_base)) {
- DRM_DEV_ERROR(&pdev->dev, "%s: failed to map phy regulator base\n", __func__);
- ret = -ENOMEM;
- goto fail;
- }
+ if (IS_ERR(phy->reg_base))
+ return dev_err_probe(dev, PTR_ERR(phy->reg_base),
+ "Failed to map phy regulator base\n");
}
if (phy->cfg->ops.parse_dt_properties) {
ret = phy->cfg->ops.parse_dt_properties(phy);
if (ret)
- goto fail;
+ return ret;
}
ret = devm_regulator_bulk_get_const(dev, phy->cfg->num_regulators,
phy->cfg->regulator_data,
&phy->supplies);
if (ret)
- goto fail;
+ return ret;
phy->ahb_clk = msm_clk_get(pdev, "iface");
- if (IS_ERR(phy->ahb_clk)) {
- DRM_DEV_ERROR(dev, "%s: Unable to get ahb clk\n", __func__);
- ret = PTR_ERR(phy->ahb_clk);
- goto fail;
- }
+ if (IS_ERR(phy->ahb_clk))
+ return dev_err_probe(dev, PTR_ERR(phy->ahb_clk),
+ "Unable to get ahb clk\n");
/* PLL init will call into clk_register which requires
* register access, so we need to enable power and ahb clock.
*/
ret = dsi_phy_enable_resource(phy);
if (ret)
- goto fail;
+ return ret;
if (phy->cfg->ops.pll_init) {
ret = phy->cfg->ops.pll_init(phy);
- if (ret) {
- DRM_DEV_INFO(dev,
- "%s: pll init failed: %d, need separate pll clk driver\n",
- __func__, ret);
- goto fail;
- }
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "PLL init failed; need separate clk driver\n");
}
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
phy->provided_clocks);
- if (ret) {
- DRM_DEV_ERROR(dev, "%s: failed to register clk provider: %d\n", __func__, ret);
- goto fail;
- }
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to register clk provider\n");
dsi_phy_disable_resource(phy);
platform_set_drvdata(pdev, phy);
return 0;
-
-fail:
- return ret;
}
static struct platform_driver dsi_phy_platform_driver = {
--
2.37.1.455.g008518b4e5-goog
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